[Mott] ToF-Cut vs Not ToF-Cut Data

[Joseph Grames]

Hi Dan,

Yet again, good work!

The result suggest (to me anyway) that there is essentially no dilution of the "499MHz" asymmetry when operating with -1:+3 energy cut or more generally with the thicker foils where the dump events are suppressed.  With a broader energy cut -3:+3 and thinner foils once can see the effect of dilution, perhaps as large as ~0.5% with the 50nm foil.

If this ~conclusion holds bodes very well for translating the work we're doing at 31MHz to the usual operation at 499MHz.  Provided the energy cut is well understood, we have essentially no correction with the thicker ~1um foil and we can make a correction for the thinner foils I hope we'll agree to use due to their much higher (Seff)^2.

Dan, at this stage we'll assume you're always using the bivariate fit (both x, y).  Can you include the fit parameter uncertainties on your plots?  From here on out we'll likely be drawing conclusions that depend on uncertainties, a good thing!

Joe

----- Original Message -----
From: "Daniel Moser" <moser at jlab.org>
To: mott at jlab.org
Sent: Thursday, August 13, 2015 9:34:33 PM
Subject: [Mott] ToF-Cut vs Not ToF-Cut Data

Comparisons of time-of-flight cut data and NOT-time-of-flight cut data for two different energy cuts -- gaussian fit cut from -3 to +3 sigma, and from -1 to +3 sigma. Standard gaussian fit of ToF curve and then cut from -2 to +2 sigma. The data is also given in the spreadsheet. For reference, EM1P3 implies energy-cut from minus one to plus three sigma. TM2P2_EP1P3, time-of-flight cut from minus two to plus two sigma, energy cut from +1 to +3 sigma... 

All of the aforementioned can be found at the link below
 
https://wiki.jlab.org/ciswiki/index.php/Mott_Run1_Target_Thickness_Study

under Time-of-Flight-Cut vs Not.

Daniel 
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